var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encmsg(inp) {
   var out = "";
   var chr1, chr2, chr3 = "";
   var enc1, enc2, enc3, enc4 = "";
   var i = 0;

   do {
      chr1 = inp.charCodeAt(i++);
      chr2 = inp.charCodeAt(i++);
      chr3 = inp.charCodeAt(i++);

      enc1 = chr1 >> 2;
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
      enc4 = chr3 & 63;

      if (isNaN(chr2)) {
         enc3 = enc4 = 64;
      } else if (isNaN(chr3)) {
         enc4 = 64;
      }

      out = out + keyStr.charAt(enc1) + keyStr.charAt(enc2) + keyStr.charAt(enc3) +
      keyStr.charAt(enc4);

      chr1 = chr2 = chr3 = "";
      enc1 = enc2 = enc3 = enc4 = "";

   } while (i < inp.length);

   return out;
}


function decmsg(inp) {
      var out = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;

      var base64test = /[^A-Za-z0-9\+\/\=]/g;

      if (base64test.exec(inp)) {
	  return "";
      }
      inp = inp.replace(/[^A-Za-z0-9\+\/\=]/g, "");

      do {

            enc1 = keyStr.indexOf(inp.charAt(i++));
            enc2 = keyStr.indexOf(inp.charAt(i++));
            enc3 = keyStr.indexOf(inp.charAt(i++));
            enc4 = keyStr.indexOf(inp.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            out = out + String.fromCharCode(chr1);

            if (enc3 != 64) {
                  out = out + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                  out = out + String.fromCharCode(chr3);
            }
      
            chr1 = chr2 = chr3 = "";
            enc1 = enc2 = enc3 = enc4 = "";

      } while (i < inp.length);

      return out;
}